split configuration into pieces

Change-Id: I3039a3e15d9637e05b0f9678a7141258fb49e983
diff --git a/src/ca-module.hpp b/src/ca-module.hpp
index 5a3da6a..e98638b 100644
--- a/src/ca-module.hpp
+++ b/src/ca-module.hpp
@@ -21,7 +21,7 @@
 #ifndef NDNCERT_CA_MODULE_HPP
 #define NDNCERT_CA_MODULE_HPP
 
-#include "configuration.hpp"
+#include "detail/ca-configuration.hpp"
 #include "detail/crypto-helpers.hpp"
 #include "detail/ca-storage.hpp"